Submission #655727

#	Time	Username	Problem	Language	Result	Execution time	Memory
655727		benjaminkleyn	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	98 ms	7500 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int N, Q;
ll S, T, A[300001], D[300000];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> N >> Q >> S >> T;
    cin >> A[0];
    for (int i = 0; i < N; i++)
    {
        cin >> A[i + 1];
        D[i] = A[i + 1] - A[i];
    }

    ll res = 0;
    for (int i = 0; i < N; i++)
        res += max(0LL, -D[i]) * T - max(0LL, D[i]) * S;

    int L, R;
    ll x;
    while (Q--)
    {
        cin >> L >> R >> x;

        res -= max(0LL, -D[L-1]) * T - max(0LL, D[L-1]) * S;
        if (R != N)
            res -= max(0LL, -D[R]) * T - max(0LL, D[R]) * S;

        D[R] -= x;
        D[L-1] += x;

        res += max(0LL, -D[L-1]) * T - max(0LL, D[L-1]) * S;
        if (R != N)
            res += max(0LL, -D[R]) * T - max(0LL, D[R]) * S;

        cout << res << '\n';
    }
    
    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60